#include <cairo.h>
#include <gtk/gtk.h>
#include <math.h>

static gboolean
on_expose_event (GtkWidget *widget,
    GdkEventExpose *event,
    gpointer data)
{
  cairo_t *cr;

  cr = gdk_cairo_create (widget->window);

  int width, height;
  gtk_window_get_size(GTK_WINDOW(widget), &width, &height);
  cairo_set_line_width(cr, 9);

  cairo_set_source_rgb(cr, 0.69, 0.19, 0);
  cairo_arc(cr, width/2, height/2, 
      (width < height ? width : height) / 2 - 10, 0, 2 * M_PI);
  cairo_stroke_preserve(cr);

  cairo_set_source_rgb(cr, 0.3, 0.4, 0.6); 
  cairo_fill(cr);

  cairo_destroy(cr);

  return FALSE;
}


int main (int argc, char *argv[])
{
  GtkWidget *window;

  gtk_init(&argc, &argv);

  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);

  g_signal_connect(G_OBJECT(window), "expose-event",
      G_CALLBACK(on_expose_event), NULL);
  g_signal_connect(G_OBJECT(window), "destroy",
      G_CALLBACK(gtk_main_quit), NULL);

  gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
  gtk_window_set_default_size(GTK_WINDOW(window), 200, 150); 

  gtk_widget_set_app_paintable(window, TRUE);
  gtk_widget_show_all(window);

  gtk_main();

  return 0;
}
